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Valid for Sitecore 5.2
Why is the thumbnail in the media browser not showing?

Q:

W hy is a thumbnail in the media browser (the Open image button in the image template field) not visible?  See the screenshot below:

/upload/sdn5/faq/media/image not found/media_browser_error.png     

A:

To make the thumbnail visible, add the modify rights on the/website/temp folder for the NETWORK SERVICE group. Sitecore uses this folder to store resized png images of the images you open with the Media Browser.